EP0937932A2 - Flexible Rohrleitung für Steigrohrleitung für Ölgewinnung aus dem Meer - Google Patents

Flexible Rohrleitung für Steigrohrleitung für Ölgewinnung aus dem Meer Download PDF

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Publication number
EP0937932A2
EP0937932A2 EP98403017A EP98403017A EP0937932A2 EP 0937932 A2 EP0937932 A2 EP 0937932A2 EP 98403017 A EP98403017 A EP 98403017A EP 98403017 A EP98403017 A EP 98403017A EP 0937932 A2 EP0937932 A2 EP 0937932A2
Authority
EP
European Patent Office
Prior art keywords
armor
external
group
flexible pipe
traction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98403017A
Other languages
English (en)
French (fr)
Other versions
EP0937932A3 (de
EP0937932B1 (de
Inventor
Bruno Roger Seguin
René Antoine Maloberti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technip Energies France SAS
Original Assignee
Coflexip SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coflexip SA filed Critical Coflexip SA
Publication of EP0937932A2 publication Critical patent/EP0937932A2/de
Publication of EP0937932A3 publication Critical patent/EP0937932A3/de
Application granted granted Critical
Publication of EP0937932B1 publication Critical patent/EP0937932B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
    • F16L11/083—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire three or more layers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • E21B17/015—Non-vertical risers, e.g. articulated or catenary-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/088—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising a combination of one or more layers of a helically wound cord or wire with one or more braided layers

Definitions

  • the present invention relates to a hybrid structure for a flexible pipe constituting a riser in a farm petroleum at sea and suitable for transporting effluents under pressure.
  • the structure according to the present invention is particularly suitable for flexible riser type pipes, that is to say flexible pipes rolled out from a surface installation such as a platform and which are connected to subsea installations and most of which does not rest on the seabed.
  • Such flexible pipes work in dynamic unlike flexible pipes laid on the seabed, say "flow line” which work mainly in static.
  • the flexible or riser lines which connect the surface to downhole equipment such as a wellhead or collector (manifold in English) present various configurations like by example those represented in the "Recommended Practice for Flexible Pipe "API 17B, edition of 01/06/88.
  • Flexible pipes designed to be used, at sea little deep or at medium depths (typically between 100 and 800 m), have structures which can vary within wide limits, depending on the conditions of use.
  • the most used flexible pipes on a farm are generally of the unbounded type in which the different successive and distinct layers have a certain freedom to move relative to each other, and they from inside to outside, a carcass made up of example of a stapled strap used to prevent the crushing of the pipe under external pressure, an internal polymer sheath, a pressure vault formed by at least one stapled wire and wound in a low-pitch spiral close to 90 °, so-called armor traction including the winding angle, measured on the longitudinal axis of the pipe is less than 55 ° and an external polymer sheath.
  • a flexible pipe is designated as a flexible hose whose element more interior is constituted by a carcass (Rough-bore in English).
  • a flexible pipe When a flexible pipe includes from the inside to the exterior, an internal sealing sheath, a built-in pressure vault by form wires wound with short pitch and intended to support the radial stresses caused by the circulation of effluents in the flexible pipe, anti-collapse sheath, one or more armor traction and pressure wrapped around the anti-collapse sheath and a external polymer sheath, it is called "Smooth-bore" because the innermost element is a tight-walled, waterproof sheath.
  • API documents 17B and 17J of the document recalled above are defined in API documents 17B and 17J of the document recalled above.
  • the flexible pipe does not include a vault pressure and the armor plies are spiraled in opposite steps with winding angles close to 55 °, In this case, the internal and external pressures as well as the tensile forces are exerted or are retained by these layers armor; such flexible pipe is said to be balanced.
  • a flexible pipe is proposed whose dimensional variations, especially in the axial direction, can be controlled so as to present during a high internal pressure setting, dimensional stability or controlled shortening.
  • the flexible pipe is designed not to not have a noticeable variation in length when subjected to an internal pressure with "direct background effect" which is induced by the pressure prevailing in the flexible pipe.
  • a flexible pipe comprising from the inside to the outside, an internal sealing sheath, a pressure vault formed by one or more windings of a wire appropriate section, an anti-collapse sheath, several layers of armor traction and an external sealing sheath.
  • the winding angle of the pressure vault winding is short, for example between 60 and 85 °, while the armoring angle of the armor traction is between 0 and 20 °. In another embodiment, the armoring angle of the tensile armor is between 75 and 90 °.
  • the sheath arranged between the vault of pressure and the first layer of tensile armor is, as usual allowed in the type of driving described, a collapse-resistant sheath. In no case, it cannot be considered as an intermediate sheath disposed between groups of tensile armor.
  • the armor are calculated to withstand all the stresses they undergo during manufacture, transport, installation, service and recovery.
  • a flexible pipe in which is formed a tube which connects the area external annular with the external environment, said tubing opening out, on the one hand, between the external sealing sheath and the last ply of upper armor and, on the other hand, in a valve that works in differential pressure.
  • the flexible pipe After connection of the flexible pipe to the equipment of bottom, the flexible pipe is subjected to external stresses which can be classified into two main categories.
  • the first category consists essentially of tensile stresses which develop, on the one hand, at the level of the connection of the upper end of the flexible pipe with surface equipment and, on the other hand, before and after the organs of flotation arranged on said pipe.
  • the second category consists of the constraints developed during the conditions of use of the flexible pipe, that is to say during the transport of the effluent or when the flexible pipe is empty, which corresponds to a circulation stop of effluent (empty pipe). In both cases, there is an internal pressure P int inside the flexible pipe and outside an external pressure P ext .
  • the background effect is called the inverse background effect.
  • the opposite background effect may have serious consequences which can lead to a deterioration of the flexible driving.
  • the object of the present invention is to propose a new structure for a flexible pipe which makes it possible to effectively oppose the opposite background effect.
  • the subject of the present invention is a flexible pipe of the type unbound and comprising, from the inside to the outside, an internal assembly and which includes a pressure vault, a first group of armor internal traction, a second group of external traction armor and a external sealing sheath, the tensile armors of said interior groups and exterior being wound with a winding angle of less than 55 °, characterized in that a sealed intermediate sheath is interposed between the two groups of interior and exterior traction armor, the group of internal traction armor being wound up at short pitch and at an angle of armor greater than 35 ° and less than 55 ° and the armor group of external traction being wound up with long pitch and with a winding angle less than 30 °.
  • the watertight internal assembly consists of a carcass internal, an internal sealing sheath and a pressure vault or by a internal sealing sheath and a pressure vault.
  • An advantage of the present invention lies in the fact that the flexible pipe withstands the reverse bottom effect well, even though eliminated, on the one hand, the anti-collapse sheath in a flexible whose element more internal is constituted by a tight sheath with smooth wall and, on the other part, the reinforcement strip which is usually placed directly under the external sealing sheath.
  • a ring finger is the space between two tubular sheaths concentric tight.
  • the inner ring finger is delimited by the sheath internal sealing and the intermediate sheath, and includes the arch of pressure and the inner armor group while the outer ring finger is delimited by the intermediate sheath and the external sealing sheath and includes the outer armor group.
  • the structure is the same as that described above with the difference that the carcass is arranged below the ring finger inside, i.e. below the internal sealing sheath.
  • the outer sheath seal When as a result of any accident, the outer sheath seal is damaged, the external pressure being exerted on the part flexible pipe at a depth of 1,800 m, for example, can reach around 180 bar; this pressure is transmitted in the ring finger outside and on the intermediate sheath, which causes the latter to press against the interior armor group.
  • the sheath intermediate constitutes a sealing barrier for the armor group inside, water that has entered the outside ring finger is not diffused in the inner ring finger, which prevents swelling of the armor plies constituting said interior armor group and their deformation in "cage bird pressure ".
  • the water pressure exerted on the external face of the intermediate sheath balances the compression forces induced on the other face of said intermediate sheath.
  • the armor group exterior cannot deform into a "bird cage" because it is maintained by the internal structure.
  • the difference between the reinforcement angles of the tensile armor groups interior and exterior is greater than 5 °, and preferably between 10 and 15 °.
  • the one or more gases present in the effluent and diffusing through the internal sheath seals are drained to the pipe surface end fitting flexible as soon as they reach the inner ring finger. Therefore, they do not not diffuse or diffuse very little through the watertight intermediate sheath, which prevents deterioration of the external armor group.
  • the outer ring finger, between the intermediate sheath and the external sealing sheath is dry, vis-à-vis the gas.
  • driving flexible is of the type in which the innermost element is constituted by a carcass and it includes, from inside to outside, a carcass metallic 1, an internal sealing sheath 2, made of a material polymer for example, a pressure vault 3, a hoop 4 constituted by a short pitch winding of a rectangular wire whose thickness is variable from one use to another, a group of tensile armor inside 5, a sealed intermediate sheath 6, polymer for example, a external traction armor group 7 and an external sealing sheath 8 also in polymeric material.
  • Fret 4 is not always used and is only of interest when the deposit mined is under high pressure, because it helps reinforcement of the pressure vault to effectively resist circumferential constraint.
  • the pressure vault 3 is constituted, for example, by a helical winding of a shaped wire around the inner sheath 2, the angle of the helix formed by the winding being close to 90 ° relative to the axis longitudinal A of said pipe.
  • the winding of the pressure vault 3 can constitute what is commonly called a resistant armor group to the circumferential component of the pressure even if it is only one winding layer.
  • the first group of armor of internal traction 5 is preferably made up of two layers of armor cables 9 and 10, wound in the opposite direction following a winding helical with short pitch whose winding angle, defined with respect to the axis longitudinal A of the pipe, is less than 55 ° but greater than 35 ° and preferably between 35 ° and 45 °.
  • These layers of tensile armor 9 and 10 have the main function of resisting the longitudinal components or axial external and internal pressures of the flexible pipe, even if they participate in the resistance of the other constraints which develop in the flexible pipe.
  • said armor plies of traction 9 and 10 will be calculated and produced in appropriate materials for proper operation depending on the effluent that will circulate in said flexible pipe and the depth of water at which it is submerged.
  • the present invention recommends to realize the group of traction armor outside 7 so that it takes up a more or less important part said other tensile stresses.
  • the second group of external traction armor 7 consists of at least one winding helical with long pitch and whose winding angle is less than 30 °.
  • the armor group of external traction 7 is constituted by a braid 11 produced for example with carbon threads.
  • the armor group of external traction 7 is constituted by two layers of armor 12 and 13 which are wound in the opposite direction with a long pitch and whose winding angle of each is less than 30 ° and preferably between 15 and 30 °.
  • the direction of the winding of the sheet 12 is, preferably but not necessarily, the same as that of the ply 9 of the tensile armor group inside 5, while the winding direction of the ply 13 is the same as that of the tablecloth 10.
  • the flexible pipe is of the type in which the innermost element is formed by a smooth sheath with a smooth wall and it includes, from the inside outwards, an internal sheath 14, the pressure vault 3, the group of internal tensile armor 5 constituted by the two layers of armor 9, 10, the sealed intermediate sheath 6, the traction armor group exterior 7 constituted by the two layers of armor 12 and 13 and finally the external sealing sheath 8.
  • the reinforcement angle of each layer of tensile armor of two interior groups 5 and 7 is less than 55 °.
  • the system of gas drainage ( Figure 4) consists of a pipe 16, one of which end 17 is inserted between the tensile armor plies 9 and 10 of the internal traction armor group 5 and the other end of which 18 opens into the open air, through an orifice 19 formed in the end fitting surface 20 of the flexible pipe.
  • the reference 21 designates the assembly constituted by all the elements located under the external sealing sheath 8, said assembly including in particular the tensile armor plies 9 and 10 of the group armor 5, between which opens the end 17 of the tubing of drainage 16.
  • the gases present in the two-phase effluent flowing in the flexible pipe diffuse through the internal sheath 2 or 14, the arch of pressure 3 and the tensile armor plies 9 and 10 of the armor group 5, and go up towards the surface end fitting 20.
  • the gases will be drained by said drainage tube 16, in the same manner as if the drainage tubing opened just below the sealing sheath external, as explained in application EP 0 341 144.
  • the presence of a valve is not necessary but nothing prevents to provide one if it is wishes, whether differential pressure or not.
  • the gases diffuse or diffuse very little through the waterproof intermediate sheath 6.
  • the inner ring finger communicates with the atmosphere, so it's at atmospheric pressure and the gas pressure exerted on the sealed intermediate sheath 6 is very low, around bar, gases having no reason to diffuse through the sealed intermediate sheath 6 since they can escape through the orifice 19.
  • curves representative of the evolution of the ratio ⁇ 1 / ⁇ 2 are drawn up as a function of the external pressure P ext for different values of the internal pressure P int (figure 5).
  • the stiffness e 2 E 2 of the external traction armor group 7 is greater than the stiffness e 1 E 1 of the internal traction armor group 5, the ratio e 2 E 2 / e 1 E 1 of said stiffnesses being greater than 1 and preferably between 1 and 4.
  • the materials suitable for producing the outer armor group there may be mentioned, in addition to carbon, a polyaramide or any other material with high elasticity modulus.
EP98403017A 1998-02-18 1998-12-02 Flexible Rohrleitung für Steigrohrleitung für Ölgewinnung aus dem Meer Expired - Lifetime EP0937932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9801969 1998-02-18
FR9801969A FR2775052B1 (fr) 1998-02-18 1998-02-18 Conduite flexible pour colonne montante dans une exploitation petroliere en mer

Publications (3)

Publication Number Publication Date
EP0937932A2 true EP0937932A2 (de) 1999-08-25
EP0937932A3 EP0937932A3 (de) 2002-08-07
EP0937932B1 EP0937932B1 (de) 2005-01-12

Family

ID=9523106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98403017A Expired - Lifetime EP0937932B1 (de) 1998-02-18 1998-12-02 Flexible Rohrleitung für Steigrohrleitung für Ölgewinnung aus dem Meer

Country Status (7)

Country Link
US (1) US6123114A (de)
EP (1) EP0937932B1 (de)
AU (1) AU748169B2 (de)
BR (1) BR9805613A (de)
DK (1) DK0937932T3 (de)
FR (1) FR2775052B1 (de)
OA (1) OA10948A (de)

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WO2001061231A1 (en) * 2000-02-16 2001-08-23 Nkt Flexibles I/S Flexible, armoured pipe and use of same
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FR2846395A1 (fr) * 2002-10-25 2004-04-30 Coflexip Conduite tubulaire flexible pour le transport d'un fluide
FR2852658A1 (fr) 2003-03-21 2004-09-24 Coflexip Conduite tubulaire flexible pour le transport d'un fluide
FR3006032A1 (fr) * 2013-05-21 2014-11-28 Technip France Conduite tubulaire flexible chauffee par le passage d'un courant electrique au sein d'armures composites en carbone
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FR3064711B1 (fr) * 2017-03-31 2019-04-12 IFP Energies Nouvelles Conduite flexible avec nappes d'armures metalliques et nappes d'armures composites
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FR2557254A1 (fr) 1983-12-22 1985-06-28 Inst Francais Du Petrole Conduite flexible ne presentant pas de variation notable de longueur, sous l'effet d'une pression interne
DE3440459A1 (de) 1984-11-06 1986-05-07 Phoenix Ag, 2100 Hamburg Folienschlauch
FR2619193A1 (fr) 1987-08-03 1989-02-10 Coflexip Conduites tubulaires flexibles stables en longueur sous l'effet d'une pression interne
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FR2665237B1 (fr) * 1990-07-27 1992-11-13 Coflexip Carcasse et conduite tubulaire flexible comportant une telle carcasse.
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FR2553859A1 (fr) 1983-10-24 1985-04-26 Coflexip Conduite tubulaire flexible en particulier pour l'industrie du petrole
FR2557254A1 (fr) 1983-12-22 1985-06-28 Inst Francais Du Petrole Conduite flexible ne presentant pas de variation notable de longueur, sous l'effet d'une pression interne
DE3440459A1 (de) 1984-11-06 1986-05-07 Phoenix Ag, 2100 Hamburg Folienschlauch
FR2619193A1 (fr) 1987-08-03 1989-02-10 Coflexip Conduites tubulaires flexibles stables en longueur sous l'effet d'une pression interne
EP0341144A1 (de) 1988-05-02 1989-11-08 Coflexip Flexible Rohrleitung, insbesondere für den Transport von Kohlenwasserstoffen

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WO2001061231A1 (en) * 2000-02-16 2001-08-23 Nkt Flexibles I/S Flexible, armoured pipe and use of same
WO2001061232A1 (en) * 2000-02-16 2001-08-23 Nkt Flexibles I/S Flexible, armoured pipe and use of same
US7069955B2 (en) 2000-02-16 2006-07-04 Nkt Flexibles I/S Flexible armoured pipe and use of same
FR2846395A1 (fr) * 2002-10-25 2004-04-30 Coflexip Conduite tubulaire flexible pour le transport d'un fluide
WO2004040183A1 (fr) * 2002-10-25 2004-05-13 Technip France Conduite tubulaire flexible pour le transport d'un fluide
NO337271B1 (no) * 2002-10-25 2016-02-29 Technip France Sa Fleksibel, rørformet ledning til transport av et fluid
FR2852658A1 (fr) 2003-03-21 2004-09-24 Coflexip Conduite tubulaire flexible pour le transport d'un fluide
WO2004085900A1 (fr) 2003-03-21 2004-10-07 Technip France Conduite tubulaire flexible pour le transport d’un fluide
US7124780B2 (en) 2003-03-21 2006-10-24 Technip France Flexible tubular fluid-transfer conduit
EP2513543A4 (de) * 2009-12-15 2016-03-02 Nat Oilwell Varco Denmark Is Unverbundener schlauch
FR3006032A1 (fr) * 2013-05-21 2014-11-28 Technip France Conduite tubulaire flexible chauffee par le passage d'un courant electrique au sein d'armures composites en carbone

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DK0937932T3 (da) 2005-06-06
BR9805613A (pt) 1999-11-09
EP0937932A3 (de) 2002-08-07
FR2775052A1 (fr) 1999-08-20
US6123114A (en) 2000-09-26
AU9710798A (en) 1999-09-02
OA10948A (en) 2003-02-27
AU748169B2 (en) 2002-05-30
FR2775052B1 (fr) 2000-03-10
EP0937932B1 (de) 2005-01-12

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